Christopher Shank

For me, it would be Vittorio Storaro. I've heard more people I respect as cinematographers say that they either learned their craft from him or that he was their model career-wise, so I'd want to learn from him. He may have not shot many films recently that get much play stateside, but looking back on his entire catalog, he's shot some of the most beautiful films in history. Just to be able to sit in a room with him would probably open my mind greatly, and would probably open a few doors as well.